some stuff here
Steven Stigler (2016) in “The Seven Pillars of Statistical Wisdom”:
data table here
“OBP” as aggregate column explanation here
In the Sherlock Holmes story, The Adventure of the Dancing Men, a criminal known to one of the characters communicates with her using a childish/child-like drawing which looks like this:
| Variable #1 | Variable #2 | Chart Names | Chart Shape |
|---|---|---|---|
| Qual | None | Bar Chart |
Bar are used to show “counts” and “tallies” with respect to Qual variables. For instance, in a survey, how many people vs Gender? In a Target Audience survey on Weekly Consumption, how many low, medium, or high expenditure people?
OK, Let’s get some data to count:
And let’s for now use a pre-set Workflow in Orange
species: Species of the penguin (Qual)island: Island where the penguin was observed (Qual)bill_length_mm: Length of the penguin’s bill in millimeters (Quant)bill_depth_mm: Depth of the penguin’s bill in millimeters (Quant)flipper_length_mm: Length of the penguin’s flipper in millimeters (Quant)body_mass_g: Mass of the penguin in grams (Quant)Research Question
How many penguins of different species are there in the dataset?
Why is this slide always showing up?

Arvind V.| VizChitra2025 | June 2025